FIX: Unsilence users on chat message flag disagree. (#19198)

* FIX: Unsilence users on chat message flag disagree.

We have an auto silence rule in place for chat message flags, so we need to unsilence users if the flag gets rejected.

Additionally, it also fixes the `disagree_and_restore` action, which wasn't recovering a deleted message.

* Update plugins/chat/spec/models/reviewable_chat_message_spec.rb

Co-authored-by: Joffrey JAFFEUX <j.jaffeux@gmail.com>

Co-authored-by: Joffrey JAFFEUX <j.jaffeux@gmail.com>

plugins/chat/app/models/reviewable_chat_message.rb

@@ -9,7 +9,6 @@ class ReviewableChatMessage < Reviewable
       agree_and_silence: :agree_and_delete,
       agree_and_suspend: :agree_and_delete,
       delete_and_agree: :agree_and_delete,
-      disagree_and_restore: :disagree,
     }
   end
 
@@ -112,6 +111,9 @@ class ReviewableChatMessage < Reviewable
 
   def disagree
     yield if block_given?
+
+    UserSilencer.unsilence(chat_message_creator)
+
     create_result(:success, :rejected) do |result|
       result.update_flag_stats = { status: :disagreed, user_ids: flagged_by_user_ids }
       result.recalculate_score = true